BLUE PEARLS What coul they be?

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Dr RBG

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What could the blue/green round things in the middle of the picture? They are bubble like and slightly translucent. Should they be removed?
_WST8300-2.jpg
 
Bubble algae. Looks neat but can rapidly grow and get out of control. Pluck it and introduce some grazers and improve nutrient export to prevent it from returning.
 

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